
public class RandomChar {     //ַ

 
    char RandomChar(){


              int num = (int)(Math.random()*3);


               switch (num){


                       case 0:return'+';


                   case 1:return'-';



                      case 2:return'*';


                      case 3:return'/';


                   default: return'o';

                }


          }

 
}